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Effects of cryopreservation, decellularization and novel extracellular matrix conditioning on the quasi-static and time-dependent properties of the pulmonary valve leaflet

机译:冷冻保存,脱细胞和新型细胞外基质调节对肺动脉瓣小叶准静态和时间依赖性的影响

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摘要

Decellularized allografts offer potential as heart valve substitutes and scaffolds for cell seeding. The effects of decellularization on the quasi-static and time-dependent mechanical behavior of the pulmonary valve leaflet under biaxial loading conditions have not previously been reported in the literature. In the current study, the stress-strain, relaxation and creep behaviors of the ovine pulmonary valve leaflet were investigated under planar-biaxial loading conditions to determine the effects of decellularization and a novel post-decellularization extracellular matrix (ECM) conditioning process. As expected, decellularization resulted in increased stretch along the loading axes. A reduction in relaxation was observed following decellularization. This was accompanied by a reduction in glycosaminoglycan (GAG) content. Based on previous implant studies, these changes may be of little functional consequence in the short term; however, the long term effects of decreased relaxation and GAG content remain unknown. Some restoration of relaxation was observed following ECM conditioning, especially in the circumferential specimen direction, which may help mitigate any detrimental effects due to decellularization. Regardless of processing, creep under biaxial loading was negligible.
机译:脱细胞的同种异体移植物可作为心脏瓣膜的替代物和用于细胞接种的支架。先前尚未在文献中报道过脱细胞作用对双轴负荷条件下肺动脉瓣小叶准静态和时间依赖性机械行为的影响。在当前的研究中,在平面双轴加载条件下研究了绵羊肺动脉瓣小叶的应力-应变,松弛和蠕变行为,以确定脱细胞的作用和新型脱细胞后细胞外基质(ECM)调节过程。如预期的那样,脱细胞作用导致沿加载轴的拉伸增加。脱细胞后观察到松弛的减少。这伴随着糖胺聚糖(GAG)含量的减少。根据以前的植入物研究,这些变化在短期内可能几乎没有功能性后果。然而,减少松弛和GAG含量的长期影响仍然未知。在ECM调节后,尤其是在周向样品方向上观察到一些松弛的恢复,这可能有助于减轻由于脱细胞作用造成的任何不利影响。不管加工如何,在双轴载荷下的蠕变都可以忽略不计。

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